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Fixed bug #33 Mike Frysinger wrote: > with libsdl-1.2.9, some games (like bomberclone) started > segfaulting in Gentoo [...snip...] > the last change in the last hunk: [...snip...] > if i change the statement to read: > (table[which].blit_features & GetBlitFeatures()) == GetBlitFeatures() > bomberclone no longer segfaults on my box Alex Volkov wrote: > The test "(table[which].blit_features & GetBlitFeatures()) == > table[which].blit_features)" is correct, and the previous > "(table[which].cpu_mmx == SDL_HasMMX())" was actually broken. I think there is potentially a slightly different cause of the above problem. During the introduction of the Altivec code, the blit_table struct field 'alpha' got changed from a straightforward enum to a bitmask, which makes perfect sense by itself. However, now the table driven blitter selection code in SDL_CalculateBlitN() can choose the wrong blitters when searching for a NO_ALPHA blitter because of the following code: int a_need = 0; ... (a_need & table[which].alpha) == a_need && When searching through the normal_blit_2[] table, a SET_ALPHA blitter (like Blit_RGB565_ARGB8888) can now be selected instead of a NO_ALPHA one, causing alpha channel bits to appear in a non-alpha destination surface. I suppose this could theoretically be an indirect cause of the segfault mentioned above. I *think* this can be fixed by changing to int a_need = NO_ALPHA;
author Sam Lantinga <slouken@libsdl.org>
date Wed, 15 Mar 2006 15:47:49 +0000
parents 355632dca928
children
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<HTML
><HEAD
><TITLE
>SDL_LoadBMP</TITLE
><META
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><H1
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NAME="SDLLOADBMP"
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>SDL_LoadBMP</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN1989"
></A
><H2
>Name</H2
>SDL_LoadBMP&nbsp;--&nbsp;Load a Windows BMP file into an SDL_Surface.</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN1992"
></A
><H2
>Synopsis</H2
><DIV
CLASS="FUNCSYNOPSIS"
><A
NAME="AEN1993"
></A
><P
></P
><PRE
CLASS="FUNCSYNOPSISINFO"
>#include "SDL.h"</PRE
><P
><CODE
><CODE
CLASS="FUNCDEF"
>SDL_Surface *<B
CLASS="FSFUNC"
>SDL_LoadBMP</B
></CODE
>(const char *file);</CODE
></P
><P
></P
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN1999"
></A
><H2
>Description</H2
><P
>Loads a surface from a named Windows BMP file.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN2002"
></A
><H2
>Return Value</H2
><P
>Returns the new surface, or <TT
CLASS="LITERAL"
>NULL</TT
> 
if there was an error.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN2006"
></A
><H2
>See Also</H2
><P
><A
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CLASS="FUNCTION"
>SDL_SaveBMP</TT
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